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    VLAN Discovery Overview

    VLAN Discovery collects a variety of SNMP MIB data to construct a VLAN (Layer 2) topology for the task’s selected “seed” devices. Multiple device vendors are supported.

    Autodiscovery can be performed using ARP and CDP cache table data to discover new devices. Alternatively, pingsweep can be used to identify reachable IP addresses within an IP range, and poll these IP addresses via SNMP. Once the SNMP data has been polled, this information can be imported to provide a Layer 2 topology view. The devices can be subsequently polled via CLI (telnet/ssh) to obtain additional information for Layer 3.

    Use these procedures to discover the Layer 2 topology, including Physical links, Spanning Tree, and VLAN information.

    You should have enabled SNMP access between the remote collection server and the layer 2 devices.

    Following is a high-level outline of the router data collection process and the associated, recommended procedures.

    • Set up a router profile containing IP addresses or IP address ranges of the devices to be collected, their SNMP community strings, and CLI login details, as explained in Setting up the Router Profile.
    • Schedule a VLAN discovery collection either through the graphical interface or through scripting mode, as explained in Scheduling a VLAN Discovery Task.
    • Schedule a Network Config Data Collection task to run immediately after the VLAN Discovery task as explained in Chaining VLAN Discovery with Network Config Data Collection.
    • Alternatively, if the collection is performed offline, import the outputs of the VLAN discovery via File > Create Network > From Collected Data to create the network topology, as described in the Router Feature Guide for IP/MPLSView, Virtual Local Area Networks chapter.

    For information on importing configuration and bridge files, refer to the Router Feature Guide for IP/MPLSView, Router Data Extraction chapter and Virtual Local Area Networks chapter.

    Modified: 2016-11-08